import numpy as np
a = [1, 2, 3]
b = [4, 5, 6]
print(a+b)
try:
    print(a*b)
except TypeError:
    print("a*b has no meaning for python lists")

c = np.arange(1,4)
d = np.arange(4,7)
print(c)
print(d)
print(c+d)
print(c*d)